Difference in Boost Converter Waveforms

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Andy Wileman 2022-2-22

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评论： Andy Wileman 2022-2-25

Hi,

I was wondering if anyone may be able to explain the differences in output waveforms for a Boost converter modelled using a Simscape Electrical N-Channel IGBT and the same circuit modelled using a PLECs IGBT?

I have created the Boost converter using equivalent circuit components, the IGBT switch, however has been modelled from the datasheet for a Infineon IKZ50N65EH5 Trenchstop 5 IGBT as the Simscape N-Channel IGBT allows you to do this by entering all the parameters into the model.

The PLECs IGBT thermal model is from the Infineon website, again for the IKZ50N65EH5 Trenchstop 5 IGBT.

When I compare the waveforms they line up, apart from the trough at the bottom of the waveform of the Simscape model (see below). To my thinking the PLECs waveform (yellow) looks what I'm used to seeing.

I wondered if anyone may be able to explain this behaviour?

Kind regards,

Andy

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Joel Van Sickel 2022-2-22

编辑：Joel Van Sickel 2022-2-22

Hello Andy,

my first guess is either the gate drive or the n-channel igbt parameterization was less than clear in the documentation and a paramter or two need to be modified to provide the results that you expect. Is this is a simple model where you could share the simscape model? If so, I could debug it to see what can be done our side to make setting up the initial simulation to work correctly. Also, if you don't want to post the model here, would you be willing to email it if I provided my email?

Regards,

Joel

Andy Wileman 2022-2-25

A huge thank you to Joel for taking the time to sort this out. It turns out it the problem is connected to transit time within the N-Channel IGBT model, the data sheet value was too high and reducing it cured the problem.

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Answer 1

Joel Van Sickel 2022-2-23

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Hey Andy,

please send me an email to jvansick@mathworks.com.

Regards,

Joel

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Answer 2

Andy Wileman 2022-2-23

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编辑：Andy Wileman 2022-2-23

Hi Joel,

Thank you for getting back to me, the gate drive or parameter idea sounds viable, there is a lot of data to interpret on the data sheet. If I could email the simulation to you that would be great as its part of research project for a major aircraft manufacturer that we are carrying out at the University.

Kind regards,

Andy